Kurt Warner has the best completion percentage for the St. Louis Rams in a game with 20+ completions, at 87.0 percent against the 49ers on October 10, 1999.

what is the highest completion percentage by a player for the rams in a game with 20 or more completions
Interpreted as:
What is the highest completion percentage by a player for the rams in a regular-season game with 20 or more completions?

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